Hand writing input device for cellular phone

Abstract

A hand writing input device for cellular phone disclosed herein is an input device which digital tablet can be in combined use with a cellular phone. In this device, a digital pen is used to input data such as handwritings or graphic data instead of entering through a key pad of cellular phone, forming an e-mail, a brief message, a document, which may be locally stored or further transmitted to another cellular phone via transmitter station or via internet to overcome the disadvantage and limit of entering data from key pad of cellular phone.

What is claimed is:  
     
       1. A hand writing input device for cellular phone comprising: 
       a digital pen containing at least an electromagnetic signal emitting circuit;  
       a digital tablet containing a signal selector, a signal amplifier, an analog/digital converter, a micro controller, and a transmission interface, and a wire grid formed of two perpendicular sets of parallel conducting wires being provided on the surface of said digital tablet;  
       by using said digital pen to input on said digital tablet, the electromagnetic signal emitted from said digital pen is received by said wire grid on said digital tablet so that current signals are induced in said wire grid whereat said digital pen and said digital tablet contacts each other, said selected current signal is amplified by said signal amplifier after passing through said signal selector, then said amplified current signal is converted to a digital signal by said analog/digital converter, and is treated in said micro controller to form data of the coordinate for the position and relative information, these data then are transmitted to said cellular phone through said transmission interface of said digital tablet and received by transmission interface of said cellular phone, these data are then treated by said cellular phone and are converted into hand written form, graphic data, or computer recognized characters through a handwriting recognition software thereby forming an e-mail, or a brief message, or a document, these data can be sent to any desired destination or stored in the cellular phone through a transmission/storage module.  
     
     
       2. The device of  claim 1 , wherein said data together with its coordinate in said micro controller can be collected and stored in accordance with said cellular phone specification to form track data and then transmitted to said cellular phone. 
     
     
       3. The device of  claim 1 , wherein said data together with its coordinate in said micro controller can be synchronously transmitted with input action in accordance with said specification of cellular phone to said cellular phone. 
     
     
       4. The device of  claim 1 , wherein said transmission interface for said digital tablet or said transmission interface for said cellular phone can be a wire transmission interface. 
     
     
       5. The device of  claim 1 , wherein said transmission interface for said digital tablet or said transmission interface for said cellular phone can be a wireless transmission interface. 
     
     
       6. The device of  claim 1 , wherein said digital pen can contain ink or ink cartridge for writing or drawing. 
     
     
       7. The device of  claim 1 , wherein a paper can be laid on the surface of said digital tablet for writing or drawing on said paper with said digital inking pen to keep hard copy of input data.